There is a minimum set of signals that must be present in order for the core to properly detect the input timing and regenerate it.
You must select these in the Timing Detection section of the core interface and also provide these signals when connecting up the core.
The Active Chroma is always an option and can be used with any of the combinations below.
It can regenerate Vertical Blank, Horizontal Blank and Active Video, if you provide the following inputs:
It can generate Vertical Blank, Horizontal Blank, Vertical Sync, Horizontal Sync, and Active Video, if you have the following input combinations:
For a detailed list of LogiCORE IP Video Timing Controller Release Notes and Known Issues, see (Xilinx Answer 32754).